Antialiasing 2-D Graphics Programming with GDI+
4.6.6 Antialiasing
Antialiasing is a technique for making the edges of graphics figures appear less jagged. To turn on antialiasing, set the Graphics objects SmoothingMode property to SmoothingMode.AntiAlias . SmoothingMode is an enumeration defined in the System.Drawing.Drawing2D namespace. Compare the arcs shown in Figur e 4 - 14 . Both arcs were drawn by calling the DrawArc method of the Graphics class, but the arc on the left was drawn with the SmoothingMode property set to SmoothingMode.None the default, and the arc on the right was drawn with the SmoothingMode property set to SmoothingMode.AntiAlias . Figur e 4- 15 shows a close-up comparison view of the upper portion of both arcs. Figure 4-14. Nonantialiased versus antialiased arcs Figure 4-15. Close-up view of nonantialiased and antialiased arcs As Figur e 4- 15 shows, antialiasing appears to improve pixel resolution by using gradient shades of the color being rendered and of the background color in this case, black and white, respectively. The downside to antialiasing is that it takes more time to render. 1744.7 Printing
Most Visual Basic .NET programs will never need to use the .NET Frameworks native printing capabilities. Reporting tools such as Crystal Reports, as well as RAD tools for laying out reports, provide most of the printing facilities that typical Visual Basic .NET programs need. However, for the cases in which a reporting tool is not flexible enough, this section describes the .NET Frameworks support for outputting text and graphics directly to a printer.4.7.1 Hello, Printer
Ex am ple 4- 13 shows a minimal printing example. Example 4-13. Hello, Printer Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Printing ... These two lines initiate printing. Place this code in an appropriate place in the application. Dim pd As New HelloPrintDocument pd.Print ... This class manages the printing process. Public Class HelloPrintDocument Inherits PrintDocument Protected Overrides Sub OnPrintPageByVal e As PrintPageEventArgs MyBase.OnPrintPagee Draw text to the printer graphics device. Dim fnt As New FontArial, 10, FontStyle.Regular, _ GraphicsUnit.Point e.Graphics.DrawStringHello, Printer, fnt, Brushes.Black, 0, 0 fnt.Dispose Indicate that there are no more pages. e.HasMorePages = False End Sub End Class Printing is managed by defining a class that inherits from the PrintDocument class defined in the System.Drawing.Printing namespace. Printing is initiated by instantiating the derived class and calling its Print method inherited from the PrintDocument class. The Print method repeatedly calls the OnPrintPage method, until the HasMorePages property of the PrintPageEventArgs parameter is set to False . It is the job of the OnPrintPage method to generate each page of output that is sent to the printer. Take a closer look at the OnPrintPage method in Ex am ple 4- 13 , starting with the first line: MyBase.OnPrintPagee This line of code calls the OnPrintPage method implemented by the base PrintDocument class, passing it the same argument that was passed into the derived classs OnPrintPage method. This call is important because the PrintDocument classs OnPrintPage method is responsible for firing theParts
» VB.NET - (O'Reilly) Programming Visual Basic NET
» What Is the Microsoft .NET Framework?
» hello, world An Example Visual Basic .NET Program
» Hello, Windows An Example Visual Basic .NET Program
» Hello, Browser An Example Visual Basic .NET Program
» Source Files Identifiers The Visual Basic .NET Language
» Numeric Literals String Literals Character Literals
» Date Literals Boolean Literals Nothing Summary of Literal Formats
» Custom Types Collections Types
» The Namespace Statement The Imports Statement
» Symbolic Constants Scope The Visual Basic .NET Language
» Access Modifiers Assignment The Visual Basic .NET Language
» Unary Operators Arithmetic Operators
» Relational Operators Operators and Expressions
» String-Concatenation Operators Bitwise Operators
» Logical Operators Operator Precedence
» Call Exit Branching Statements
» Goto If RaiseEvent Branching Statements
» Return Select Case Branching Statements
» For Each Iteration Statements
» Object Instantiation and New Constructors
» Handling Events Inheritance Classes
» Passing arrays as parameters
» Variable-length parameter lists Main method
» Implementing interface methods Overriding inherited methods
» Overloading Overloading inherited methods
» The MyBase Keyword Nested Classes Destructors
» Interfaces The Visual Basic .NET Language
» Enumerations The Visual Basic .NET Language
» Exceptions The Visual Basic .NET Language
» Delegates The Visual Basic .NET Language
» Using Events and Delegates Together
» Creating Custom Attributes Attributes
» Standard Modules Conditional Compilation
» Summary The Visual Basic .NET Language
» Common Language Infrastructure CLI and Common Language Runtime CLR
» Global Assembly Cache GAC Comparison of Assemblies, Modules, and Namespaces
» Application Domains Common Language Specification CLS
» Intermediate Language IL and Just-In-Time JIT Compilation Metadata
» Finalize Memory Management and Garbage Collection
» Dispose Memory Management and Garbage Collection
» A Brief Tour of the .NET Framework Namespaces
» Configuration File Format Configuration
» Configuration Section Groups The appSettings Section
» Adding event handlers Creating a Form in Code
» Handling Form Events Windows Forms I: Developing Desktop Applications
» Relationships Between Forms Windows Forms I: Developing Desktop Applications
» Merging Menus MDI Applications
» Detecting MDI Child Window Activation
» Component Attributes Windows Forms I: Developing Desktop Applications
» The Graphics Class 2-D Graphics Programming with GDI+
» The Pen Class 2-D Graphics Programming with GDI+
» The Brush Class 2-D Graphics Programming with GDI+
» System colors The Color Structure
» Alpha Blending 2-D Graphics Programming with GDI+
» Antialiasing 2-D Graphics Programming with GDI+
» The PrintPageEventArgs Class Printing
» The OnBeginPrint and OnEndPrint Methods Choosing a Printer
» The PageSettings Class Printing
» The PrinterSettings Class Printing
» Page Setup Dialog Box Print Preview
» Summary Windows Forms I: Developing Desktop Applications
» The Button Class The CheckBox Class The ComboBox Class
» The DateTimePicker Class The GroupBox Class The ImageList Class
» The Label Class The LinkLabel Class
» The ListBox Class Common Controls and Components
» The ListBox.ObjectCollection Class
» The ListView Class Common Controls and Components
» The MonthCalendar Class Common Controls and Components
» The Panel Class The PictureBox Class
» The RadioButton Class Common Controls and Components
» The TextBox Class The Timer Class
» Other Controls and Components
» Control Events Windows Forms II: Controls, Common Dialog Boxes, and Menus
» The Anchor Property Form and Control Layout
» Controlling dock order The Dock Property
» The Splitter control The Dock Property
» ColorDialog FontDialog OpenFileDialog Common Dialog Boxes
» PageSetupDialog PrintDialog PrintPreviewDialog SaveFileDialog
» Adding Menus in the Visual Studio .NET Windows Forms Designer
» Programmatically Creating Menus Menus
» Building Controls from Other Controls
» Building Controls That Draw Themselves Building Nonrectangular Controls
» Summary Windows Forms II: Controls, Common Dialog Boxes, and Menus
» Setting control properties using attributes Adding event handlers
» AutoEventWireup Handling Page Events
» The Button control Web Controls
» The CheckBox control The DropDownList control
» The Image control The Label control
» The ListBox control Web Controls
» The RadioButton control Web Controls
» The Table control Web Controls
» The TextBox control Web Controls
» Other web controls Web Controls
» HTML Controls Handling Control Events
» Programmatically Instantiating Controls More About Server Controls
» More About Validation-Control Tag Attributes
» Using Validation-Control Properties Providing a Summary View of Validation Failures
» Performing Custom Validation Adding Validation
» Using Directives to Modify Web Page Compilation
» The Server Object ASP.NET Objects: Interacting with the Framework
» The Application Object The Session Object The Cache Object The Request Object
» The Response Object ASP.NET Objects: Interacting with the Framework
» Discovering Browser Capabilities ASP.NET and Web Forms: Developing Browser-Based Applications
» The Session Object Maintaining State
» The Application Object Maintaining State
» Session and Application Startup and Shutdown global.asax Compiles to a Class
» Adding Global Objects Application-Level Code and global.asax
» ASP.NET authorization Authorization
» Windows NTFS authorization Code-access authorization
» IUSR_ComputerName Impersonation Accessing Network Resources
» User Controls Designing Custom Controls
» Creating a custom server control using Visual Studio .NET
» Creating a custom server control in code Using a custom server control in Visual Studio .NET
» Summary ASP.NET and Web Forms: Developing Browser-Based Applications
» The WebService Attribute The WebMethod Attribute
» Testing a Web Service with a Browser
» Consuming a Web Service in Visual Studio .NET
» Consuming a Web Service in Notepad
» Synchronous Versus Asynchronous Calls
» Web-Service Descriptions Web-Service Discovery
» Limitations of Web Services Summary
» A Brief History of Universal Data Access Managed Providers
» Connecting to a SQL Server Database
» Connecting to an OLE DB Data Source
» The DataSet Class Finding Tables
» Finding Column Values Finding Column Definitions Changing, Adding, and Deleting Rows
» Writing Updates Back to the Data Source
» Relations Between DataTables in a DataSet
» The DataSets XML Capabilities
» Binding a DataSet to a Windows Forms DataGrid
» Binding a DataSet to a Web Forms DataGrid
» Typed DataSets ADO.NET: Developing Database Applications
» Reading Data Using a DataReader
Show more